Move package verifier from libinstall to libotautil

So it can be used by device-specific codes.

Bug: 184693830
Test: m; atest recovery_unit_test
Change-Id: I5885334c1bd04214c9cc295f2337306261a1735c
diff --git a/tests/unit/package_test.cpp b/tests/unit/package_test.cpp
index 164a93d..66882bb 100644
--- a/tests/unit/package_test.cpp
+++ b/tests/unit/package_test.cpp
@@ -26,7 +26,7 @@
 #include <ziparchive/zip_writer.h>
 
 #include "common/test_constants.h"
-#include "install/package.h"
+#include "otautil/package.h"
 
 class PackageTest : public ::testing::Test {
  protected: